GILLIG LOW FLOOR, Service Manual, Page: 106 / 506

Engine
06
Lumpy Belts
(See Figure 3- 25.) Lumpy belts usually occur, and are more noticeable,
on variable speed drives and other high speed belt installations. The
result is excessive vibration. If belts are not relieved of tension while
the vehicle is stored, there will often be temporary vibration on start-
up after the storage period. Give the belts time to straighten out before
diagnosing lumpy belts.
20-100-x149
OK
LUMPY
BELTS
Figure 3-25, Lumpy Belts
OK
20-100-x144
INTERNAL
CORD FAILURE
Figure 3-26, Internal Cord Failure
Improper Length
It is possible that an improper length belt could accidentally be installed on an engine. Always check to
be certain that the belt length is correct prior to installation.
Internal Cord Failure
(See Figure 3- 26.) Failure of one or more of the internal tension
cords will result in the belt rolling out of the pulley groove. Cords
may be broken by prying the belt over the pulley instead of prop-
erly loosening the tension adjustment.